EDIT: As many have pointed out, the whole Lunar Collision aspect I originally envisioned is probably more extreme than I predicted. I don't know where to start as far as the math goes, although my gut ...

Assuming a technologically advanced civilization that has grown sustainably from the resources of its own planet (and maybe "a few" additional resources from its own solar system), what would be the ...

The Setting
Long story short, we cracked the code of the universe and then reprogrammed it to give ourselves admin privileges. But then, we realized that having top-level access is boring. There is ...

Suppose some magical civilization on Earth-like planet can create portals. Any given portal entrances are spherical surfaces of the same radius. Any particle enters one sphere and exits another in the ...

In the mythology of the Lambas people of Zambia, there is a creature called the Ichisonga. It is a herbivore, and very rhinoceros-like in appearance.
Upon hearing a hippopotamus, it allegedly sneaks ...

Phytoplankton are not to be taken for granted. Not only do they form the core of marine food webs around the world, they also release half of the world's oxygen. But phytoplankton, being plant-like ...

"Tree" is (apparently) not a very well defined term as far as scientific classifications are concerned, so I'll put my own restrictions on it for this question:
Typical healthy adult specimens must ...

When one hears the name "Beringia", we most often think the land bridge that formed as a result of a drop in sea levels during the Pleistocene, resulting in a connection between Alaska and Russia. But ...

My world is at the outer edge of the habitable zone. There is enough heat and geological activity to start life, but a snowball earth is looming and threatens to freeze it all. There is some spring ...

So far, I've begun developing a food web for a swampy biome. Currently, the result of this free building is shown in the mess below (built = orange, aquatic = blue, producer = green, not built yet = ...

Humans all belong to a Single Species, localized on a single small-ish planet... Yet we are incredibly diverse in both Culture and Individual Appearance/Adaptation to our environment. This also seems ...

So, we've gone off to another star system and decided to build a Dyson bubble--a continuous statite, supported by radiation pressure, surrounding a star--with a surface gravity of 1g to live on.
Now, ...

I want to create artificial ecosystem.
I don't want to do it in random way like "We have cats but lets name them kads. They live in forest... of mushrooms. And there is a river. I think it is enough....

Basically, I'm trying to see if a land-based creature roughly between 50-100 ft. long could exist on Earth at the moment and still be scientifically plausible. I know that whales and other creatures ...

There is no other way around it--Madagascar is an evolutionary uniquety. 80% of the island's species live nowhere else on Earth. Among this uniqueness is a habitat that seems to come out of science ...

In the world of this question, ants and especially termites are the dominant herbivores by mass. There are no large grazing mammals competing with the bugs for the siliceous grasses and thorny trees ...

I am designing a monster that is as large as a continent. It flies across the planet very slowly and has basically a snake form. Life cannot exist on the planet's surface so the animals are drawn to ...

The setting would be on Titan in the 2200s. Because the institute preventing intrusions on new worlds that have possible organisms has very little money, they scan Titan on the surface, they don't see ...

This scenario is based on the kea, the world's only alpine parrot.
Even though it eats plants like other parrots, it also eats meat, and therefore could be New Zealand's answer to the smaller diurnal ...

Just a bit of background: one of my favorite zombie causers is from the Dead Rising video game series. In it, the undead are reanimated by a wasp-like insect that lays eggs in a corpse (I think. It's ...

I have had an idea for a possible story, where the protagonists are some kind of future, sapient hominid descendants (Not descended from humans; bonobos or gorillas or something).
The main premise of ...

In the future, we created a Dyson Swarm.
Each node (which I'd like to call a Gigalga) is an asteroid-sized, biotechnological, space-adapted, sentient plant that speaks the same evolved language as we ...

I won't describe in much detail the geology and astronomy of the world I'm creating here, whose unnatural shape and so far unexplained non-Einsteinian large-scale mechanics to maintain it may not be ...

As it turns out, conifers are not the only trees to grow in boreal forests, or taiga. At the southernmost ends, the evergreens are mixed with such deciduous trees as:
Birch
Alder
Willow
Poplar
Maple
...

Just a silly idea for some sort of potentially major event, but what would happen if say the mind of cat entered the body of a mouse and vice versa, for every animal on Earth? Let's also assume that ...

In an alternate Earth, coral has been extinct for over 400 million years. In their place were the following:
Bivalvia (clams, oysters, mussels)
Cirripedia (barnacles)
Canalipalpata (bristle-foot or ...

As per the Koppen climate model, for the purposes of this question deserts are dry, non-polar climates.
https://en.wikipedia.org/wiki/Desert_climate
At a hypothetical time in near future, the human ...

In accommodation to my last question, we are now transferring from meteorology to ecology.
Today, tropical rainforests take up only 3% of the world's surface, yet they take up half of the plant and ...

Imagine that, in the near future, pollution, overpopulation and war leads to a massive extinction where almost all chordates, some invertebrates and many plants are wiped out. Small, resilient plants, ...